Year	Percent
1995	55.09
1996	55.03
1997	55.33
1998	56.49
1999	56.94
2000	56.8
2001	55.84
2002	55.9
2003	56.4
2004	56
2005	55.92
2006	55.12
2007	54.88
2008	53.96
2009	52.33
2010	46.94